Robert_Charlton - 9:02 pm on Feb 14, 2011 (gmt 0)
If that is the case, then...
sdani - I wasn't suggesting that there was any kind of simple answer on this. If you read the Google Support Forum threads, you'll see that there appear to be a variety of issues, apparently DNS related. I can't comment, because I'm completely unfamiliar with the setup on Google appspot.
I think I can say that the issue goes beyond simply an algorithm that can't handle dupe content. I don't think that sufficiently describes what's happening here. Some webmasters affected apparently can't (or couldn't at the time of posting) access their own sites... which suggests that Googlebot can't either.